Question about servlet in a package

hello
i use tomcat4.0,and write a simple servlet "Hello.java",put it in "C:\jakarta-tomcat-4.0\webapps\ee\WEB-INF\classes",i input "http://127.0.0.1:8080/ee/servlet/Hello",the code works well,but after i add a package declaration "package hi;" in front of my servlet,and put it in "C:\jakarta-tomcat-4.0\webapps\ee\WEB-INF\classes\hi\",wheather i input "http://127.0.0.1:8080/ee/hi/servlet/Hello" or "http://127.0.0.1:8080/ee/servlet/hi/Hello",both of them don't work,why?and how can i call a servlet that is in a package from the browser? thanks!
my code:
package hi;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Hello extends HttpServlet{
     public void service(HttpServletRequest req,
          HttpServletResponse resp)
          throws IOException,
               ServletException{
          resp.setContentType("text/html");
          PrintWriter out=new PrintWriter(resp.getOutputStream());
          out.print("<html>");
          out.print("<body>");
          out.print("hello world!");
          out.print("</body>");
          out.print("</html>");
          out.close();

Hi,
Open your ee/web-inf/web.xml file and add these lines.
<servlet>
<servlet-name>
Hello
</servlet-name>
<servlet-class>
hi.Hello
</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>
Hello
</servlet-name>
<url-pattern>
/Hello
</url-pattern>
</servlet-mapping>
Start the tomcat and give the URL,
http://127.0.0.1:8080/ee/servlet/Hello
Hope this helps.
If you don't have a web.xml file there, you can add these lines in your Tomcat\conf\web.xml file.
Sudha

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Question about servlet architecture

Hello,
I have a question about Web Application / servlet architecture and development, and haven't had any luck finding an answer so far. My plan must be either unusual, or wrong, or both, so I'm hoping the community here could point me in the right direction.
I have quite a bit of background in OSGi, but very little in servlets. I know my architecture would work with something such as sever-side Equinox, but for the open source project I'm contemplating, I think that the more mainstream Tomcat/servler route would be better -- assuming it can be done. Here is a rather simplified scenario:
There is a class, Manager. It could be a Java class that implements Runnable, or a non-HTTP servlet (GenericServlet?), but somehow it should be configured such that it runs as soon as Tomcat starts.
When Manager runs, it instantiates its primary member variable: Hashtable msgHash; mshHash will map Strings (usernames) to ArrayList<String> (list of messages awaiting that user). Manager also has two primary public methods: addMsg() and getMsgs().
The pseudocode for addMsg is:
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if username=="*" { for each msgList in msgHash { msgList.add(msg) } return;
if username not in msgHash { msgHash.add(username, new ArrayList<String>) }
msgHash[username].add(msg)
And for getMsgs():
String getMsgs(username) {
String s = "";
for each msg in msgHash[username] { s = s + msg; }
return s;
Once Manager has started, it starts two HTTP Servlets: Sender and Receiver, passing a reference back to itself as it creates the servlets.
The HTML associated with Sender contains two text inputs (username and message) and a button (send). When the send button is pressed and data is POSTed to Sender, Sender takes it and calls Manager.addMsg(username.value, message.value);
Receiver servlet is display only. It looks in the request for HTTP GET parameter "username". When the request comes in, Receiver calls Manager.getMsgs(username) and dumps the resulting string to the browser.
In addition to starting servlets Sender and Receiver, the Manager object is also spawning other threads. For example, it might spawn a SystemResourceMonitor thread. This thread periodically wakes up, reads the available disk space and average CPU load, calls Manager.addMsg("*", diskAndLoadMsg), and goes back to sleep for a while.
I've ignored the synchronization issues in this example, but during its lifecycle Manager should be idle until it has a task to do, using for example wait() and notify(). If ever addMsg() is called where the message string is "shutdown", Manager's main loop wakes up, and Manager shuts down the two servlets and any threads that it started. Manager itself may then quit, or remain resident, awaiting a command to turn things back on.
Is any of this appropriate for servlets/Tomcat? Is there a way to do it as I outlined, or with minor tweaks? Or is this kind of application just not suited to servlets, and I should go with server-side Equinox OSGi?
Thanks very much for any guidance!
-Mike

FrolfFla wrote:
Hello,
I have a question about Web Application / servlet architecture and development, and haven't had any luck finding an answer so far. My plan must be either unusual, or wrong, or both, so I'm hoping the community here could point me in the right direction.
I have quite a bit of background in OSGi, but very little in servlets. I know my architecture would work with something such as sever-side Equinox, but for the open source project I'm contemplating, I think that the more mainstream Tomcat/servler route would be better -- assuming it can be done. Here is a rather simplified scenario:
There is a class, Manager. It could be a Java class that implements Runnable, or a non-HTTP servlet (GenericServlet?), but somehow it should be configured such that it runs as soon as Tomcat starts.You can configure a servlet to be invoked as soon as Tomcat starts. Check the tomcat documentation for more information on that (the web.xml contains such servlets already though). From this servlet you can start your Manager.
>
When Manager runs, it instantiates its primary member variable: Hashtable msgHash; mshHash will map Strings (usernames) to ArrayList<String> (list of messages awaiting that user). Manager also has two primary public methods: addMsg() and getMsgs().
The pseudocode for addMsg is:
void addMsg(String username, String msg) {
if username=="*" { for each msgList in msgHash { msgList.add(msg) } return;
if username not in msgHash { msgHash.add(username, new ArrayList<String>) }
msgHash[username].add(msg)
And for getMsgs():
String getMsgs(username) {
String s = "";
for each msg in msgHash[username] { s = s + msg; }
return s;
Once Manager has started, it starts two HTTP Servlets: Sender and Receiver, passing a reference back to itself as it creates the servlets. Not needed. You can simply create your two servlets and have them invoked through web calls, Tomcat is the only one that can manage servlets in any case. Servlets have a very short lifecycle - they stay in memory from the first time they are invoked, but the only time that they actually do something is when they are called through the webserver, generally as the result of somebody running the servlet through a webbrowser, either by navigating to it or by posting data to it from another webpage. The servlet call ends as soon as the request is completed.
>
The HTML associated with Sender contains two text inputs (username and message) and a button (send). When the send button is pressed and data is POSTed to Sender, Sender takes it and calls Manager.addMsg(username.value, message.value);
Receiver servlet is display only. It looks in the request for HTTP GET parameter "username". When the request comes in, Receiver calls Manager.getMsgs(username) and dumps the resulting string to the browser.This states already that you are going to run the servlets through a browser. You run "Sender" by navigating to it in the browser. You run "Receiver" when you post your data to it. Manager has nothing to do with that.
>
In addition to starting servlets Sender and Receiver, the Manager object is also spawning other threads. For example, it might spawn a SystemResourceMonitor thread. This thread periodically wakes up, reads the available disk space and average CPU load, calls Manager.addMsg("*", diskAndLoadMsg), and goes back to sleep for a while.Since you want to periodically run the SystemResourceMonitor, it is better to use a Timer for that in stead of your own thread.
>
I've ignored the synchronization issues in this example, but during its lifecycle Manager should be idle until it has a task to do, using for example wait() and notify(). If ever addMsg() is called where the message string is "shutdown", Manager's main loop wakes up, and Manager shuts down the two servlets and any threads that it started. Manager itself may then quit, or remain resident, awaiting a command to turn things back on.
Is any of this appropriate for servlets/Tomcat? Is there a way to do it as I outlined, or with minor tweaks? Or is this kind of application just not suited to servlets, and I should go with server-side Equinox OSGi?
Thanks very much for any guidance!
-MikeI don't see anything that cannot be done in a normal java web environment, as long as you are aware of how servlets operate.

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Hi,
Open your ee/web-inf/web.xml file and add these lines.
<servlet>
<servlet-name>
Hello
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<servlet-class>
hi.Hello
</servlet-class>
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<servlet-mapping>
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Hello
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tony5429 wrote:1. With b43, would I still need to rebuild/reinstall the package every time the kernel is upgraded?
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Question about servlet.xml setting

<?xml version="1.0" encoding="UTF-8"?>

<Server port="8025" shutdown="TEARSDOWN">

<Listener className="org.apache.catalina.core.AprLifecycleListener"/>
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<Server port="8025" shutdown="TEARSDOWN">

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Could you help me to check this file setting? Just check this "servlet.xml". Thank you very much!

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Hello my name is Raj,
My problem as a beginner is to compile a servlet but not servlet alone becoz theres a several class imported in this servlet.
Should I compile every .java and then the servlet....coz when I compile the servlet with a normal jdk (latest one) it gives error of importing class...
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Hi,
I am running WebSphere and when i put my sevlets directly under the classes folder and map it in the web.xml file, they seem to work fine.
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koro wrote:Hi, I installed Blender 2.46.
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Hi!!
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